如何使这段代码工作？ [英] How do I make this piece of code work?
问题描述
我试图让粒子在250 = 250时爆炸，当b == 250但是它不起作用
我尝试过：
var a = 500;
var b = 490;
var pA;
功能设置（）{
var canvas = createCanvas（500,500）;
canvas。 parent（画架）;
textSize（50）;
angleMode（DEGREES）;
pA = new Array（500）;
for（var i = 0; i< 500; i ++）{
pA [i] = new Particle（250,250,0,5 ，-5,5）;
}
} < br $>
函数抽奖（）{
背景（255,255,0）;
stroke（255,0,0）;
strokeWeight（3）;
line（250，a，250，b）;
if（a> 250）{
a -
};
if（b> 250）{
b--
};
if（b == 250）{
stroke（255,0,0）;
strokeWeight（2）;
for（var i = 0; i <500; i ++）{
point（pA [i] .x，pA [i] .y）;
pA [i] .x + = pA [i] .vx;
pA [i] .y + = pA [i] .vy;
}
};
函数粒子（x，y，vx1，vx2，vy1，vy2）{
this.x = x;
this.y = y;
this.vx = random（vx1，vx2）;
this.vy = random（vy1，vy2）;
}
\
}
< blockquote class =quote>引用：但它无法正常工作
这不是提供信息，请使用调试器查看代码正在做。
有一个工具可以让你看到你的代码在做什么，它的名字是调试器。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。
当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。
使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。
调试器 - 维基百科，免费的百科全书 [ ^ ]
JavaScript调试 [ ^ ]
Chrome DevTools | 网络 | Google Developers [ ^ ]
调试器在这里向您展示您的代码正在做什么，您的任务是与它应该做什么进行比较。
调试器中没有魔法，它不是'找到错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。
I am trying to make the particles explode at 250,250 when b==250 but its not working
What I have tried:
var a=500;
var b=490;
var pA;
function setup() {
var canvas=createCanvas(500,500);
canvas.parent("easel");
textSize(50);
angleMode(DEGREES);
pA=new Array(500);
for(var i=0;i<500;i++){
pA[i]=new Particle(250,250,0,5,-5,5);
}
}
function draw() {
background(255,255,0);
stroke(255,0,0);
strokeWeight(3);
line(250,a,250,b);
if(a>250){
a--
};
if(b>250){
b--
};
if(b==250) {
stroke(255,0,0);
strokeWeight(2);
for(var i=0;i<500;i++){
point(pA[i].x, pA[i].y);
pA[i].x+=pA[i].vx;
pA[i].y+=pA[i].vy;
}
};
function Particle(x,y,vx1,vx2,vy1,vy2){
this.x=x;
this.y=y;
this.vx=random(vx1,vx2);
this.vy=random(vy1,vy2);
}
\
}
Quote:but its not working
This is not informative, use the debugger to see what the code is doing.
There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[^]
JavaScript Debugging[^]
Chrome DevTools | Web | Google Developers[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.
这篇关于如何使这段代码工作？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
